JPH0480570B2 - - Google Patents
Info
- Publication number
- JPH0480570B2 JPH0480570B2 JP59072364A JP7236484A JPH0480570B2 JP H0480570 B2 JPH0480570 B2 JP H0480570B2 JP 59072364 A JP59072364 A JP 59072364A JP 7236484 A JP7236484 A JP 7236484A JP H0480570 B2 JPH0480570 B2 JP H0480570B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- station
- master station
- slave
- transmitter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000005540 biological transmission Effects 0.000 claims description 31
- 230000006854 communication Effects 0.000 claims description 27
- 238000004891 communication Methods 0.000 claims description 27
- 230000007176 multidirectional communication Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000012546 transfer Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
- H04B7/0608—Antenna selection according to transmission parameters
- H04B7/061—Antenna selection according to transmission parameters using feedback from receiving side
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
- H04B7/18534—Arrangements for managing transmission, i.e. for transporting data or a signalling message for enhancing link reliablility, e.g. satellites diversity
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Radio Relay Systems (AREA)
- Radio Transmission System (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、散在する多数の子局と一つの親局と
で構成される時分割多方向無線通信網に利用され
るスペース・ダイバシテイ通信方式に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a space diversity communication system used in a time-division multidirectional wireless communication network consisting of a large number of scattered slave stations and one master station. .
第１図は、時分割多方向通信網を説明する図で
ある。この通信網では親局７０から時分割多重化
された信号が複数の子局７５Ａ，７５Ｂ，…７５
Ｈに対して一斉に連続モードで送信され、一方子
局７５Ａ，７５Ｂ，…７５Ｈのそれぞれの局で
は、親局クロツクに同期して自局に割り当てられ
た時間帯Ａ，Ｂ，…Ｈに親局７０へバースト状に
送信が行われ、親局７０では子局７５Ａ，７５
Ｂ，…７５Ｈのそれぞれの局からのバースト信号
を時間軸ｔ上に時間帯TF内に整列するようにし
て、親局７０のクロツクにより受信信号の識別お
よび再生ができるように構成されている。
FIG. 1 is a diagram illustrating a time division multidirectional communication network. In this communication network, signals time-division multiplexed from the master station 70 are transmitted to multiple slave stations 75A, 75B,...75.
On the other hand, each of the slave stations 75A, 75B, ... 75H transmits data in the time slots A, B, ...H assigned to it in synchronization with the master station clock. Transmission is performed in bursts to the station 70, and the master station 70 sends the slave stations 75A, 75
The burst signals from each of the stations B, . .
このような時分割多方向通信網では、親局７０
と子局７５Ａ，７５Ｂ，…７５Ｈの伝搬路が長距
離である場合あるいは海上に存在する場合にはス
ペース・ダイバシテイ装置を適用して、回線品質
を改善する必要がある。 In such a time-division multidirectional communication network, the master station 70
When the propagation paths of the slave stations 75A, 75B, .
ところで、２地点間の通信を目的とした対向回
線のスペース・ダイバシテイ装置としては、第２
図に示すように主アンテナ５１および副アンテナ
５２からの受信信号をそれぞれ復調再生し、符号
誤り率の少ない方の復調信号を切換選択するベー
スバンド切換装置が実用化されている。すなわ
ち、第２図において、符号１は送信側ベースバン
ド信号処理回路、符号２は送信機、符号３ａおよ
び３ｂはそれぞれ主アンテナ５１あるいは副アン
テナ５２からの信号を受信する受信機、符号４は
各受信機で復調されたベースバンド信号を切換え
る信号切換器、符号５は受信側ベースバンド信号
処理回路、符号６は信号切換器４の切換制御信号
を生成する競合計数回路である。 By the way, as a space diversity device for opposing lines for the purpose of communication between two points, the second
As shown in the figure, a baseband switching device has been put into practical use that demodulates and reproduces received signals from a main antenna 51 and a sub-antenna 52, respectively, and switches and selects the demodulated signal with a lower bit error rate. That is, in FIG. 2, reference numeral 1 denotes a transmitting side baseband signal processing circuit, 2 a transmitter, 3a and 3b receivers that receive signals from the main antenna 51 or the auxiliary antenna 52, respectively, and 4 each A signal switcher for switching the baseband signal demodulated by the receiver; reference numeral 5 is a receiving side baseband signal processing circuit; reference numeral 6 is a competition counting circuit that generates a switching control signal for the signal switcher 4;
しかし、この従来例ベースバンド切換装置を多
方向通信網にそのまま適用すると、複数の子局の
信号を受信している親局では、子局ごとに独立に
回線状態を監視し回線品質を制御することにな
る。また、複数の子局でスペース・ダイバシテイ
通信が回線品質上必要になつた場合に、親局にて
主アンテナと副アンテナを設置すると、伝播路が
それぞれ異なる子局に対して主、副アンテナ間隔
を最適に選択することが一般には困難であつて、
十分なスペース・ダイバシテイ効果が得られない
欠点があつた。 However, if this conventional baseband switching device is applied as is to a multidirectional communication network, a master station receiving signals from multiple slave stations will have to monitor the line status of each slave station independently and control the line quality. It turns out. In addition, when space diversity communication is required for line quality with multiple slave stations, if a main antenna and a sub-antenna are installed at the master station, the distance between the main and sub-antennas will increase for the slave stations with different propagation paths. It is generally difficult to optimally select
The drawback was that sufficient space diversity effects could not be obtained.
また、衛星用の時分割多元接続システムにおい
て、子局に二つのアンテナを備え、自局の送信信
号を衛星を介して折り返して受信して、子局で受
信信号のビツト誤り率を測定してアンテナを切り
換える技術も提案されている（特開昭58−84518
号公報）。しかし、子局からの信号を親局を介し
て折り返すとすると、折り返し回線を構築するた
めに回線の利用効率が悪化する問題がある。 In addition, in a satellite time division multiple access system, a slave station is equipped with two antennas, receives its own transmitted signal by looping it back through the satellite, and measures the bit error rate of the received signal at the slave station. A technique for switching antennas has also been proposed (Japanese Patent Application Laid-Open No. 58-84518
Publication No.). However, if the signal from the slave station is looped back via the master station, there is a problem in that the line utilization efficiency deteriorates due to the construction of the loop back line.
本発明は、前述の欠点を除去するもので、時分
割多方向通信網に利用しても、親局で子局ごとに
独立に回線品質を改善することができ、また、十
分なスペース・ダイバシテイ効果を得るために親
局アンテナ設置条件に制約がなく、さらに回線利
用効率のよいスペース・ダイバシテイ通信方式を
提供することを目的とする。 The present invention eliminates the above-mentioned drawbacks, and even when used in a time-division multidirectional communication network, the line quality can be improved independently for each slave station at the master station, and sufficient space diversity can be achieved. The purpose of the present invention is to provide a space diversity communication system that has no restrictions on the installation conditions of the master station antenna in order to obtain the desired effect, and that also has good line utilization efficiency.
本発明は、一つの親局と、複数の子局とを備
え、上記子局のそれぞれは自局に割り当てられた
時間帯に上記親局へバースト信号を送信し、上記
親局は上記子局のそれぞれからこのバースト信号
を時系列的に受信するように構成され、上記子局
のうちダイバシテイ通信を必要とする子局の送信
装置には、二つのアンテナと、この二つのアンテ
ナのいずれかに接続できる一つの送信機と、この
送信機の出力を上記二つのアンテナのいずれの入
力に接続するかの選択を実行する送信信号切換手
段とを備えた時分割多方向通信のスペース・ダイ
バシテイ通信方式において、上記子局の送信信号
切換手段は、上記親局から送信される制御信号に
基づいてその局に割り当てられたバースト信号を
送信する時間帯以外の時間帯に切換を実行する手
段を備え、上記親局には、上記送信機からの信号
を復調した信号の符号誤り率を上記ダイバシテイ
通信を必要とする子局ごとに検出して上記制御信
号を生成する手段と、この制御信号を該当する子
局に転送する手段とを備えたことを特徴とする。
The present invention includes one master station and a plurality of slave stations, each of the slave stations transmits a burst signal to the master station during a time slot assigned to itself, and the master station transmits a burst signal to the slave station in a time slot assigned to it. The transmitting device of the slave station that requires diversity communication among the slave stations described above is configured to receive this burst signal in time series from each of the two antennas and one of the two antennas. A space diversity communication system for time-division multidirectional communication, comprising one connectable transmitter and a transmission signal switching means for selecting which input of the two antennas the output of this transmitter is connected to. wherein the transmission signal switching means of the slave station includes means for performing switching in a time zone other than the time zone in which the burst signal assigned to that station is transmitted based on the control signal transmitted from the master station; The master station includes a means for detecting the code error rate of a signal obtained by demodulating the signal from the transmitter for each slave station requiring diversity communication and generating the control signal, and means for transmitting data to a slave station.
また本発明は、一つの親局と、複数の子局とを
備え、上記子局のそれぞれは自局に割り当てられ
た時間帯に上記親局へバースト信号を送信し、上
記親局は上記子局のそれぞれからこのバースト信
号を時系列的に受信するように構成され、上記子
局のうちダイバシテイ通信を必要とする子局の送
信装置には、二つのアンテナと、この二つのアン
テナのそれぞれに信号を送出し同一の入力に接続
された二つの送信機と、この送信機の出力を上記
二つのアンテナのいずれの入力に接続するかの選
択を実行する送信信号切換手段とを備えた時分割
多方向通信のスペース・ダイバシテイ通信方式に
おいて、上記子局の送信信号切換手段は、上記親
局から送信される制御信号に基づいてその局に割
り当てられたバースト信号を送信する時間帯以外
の時間帯に切換を実行する手段を備え、上記親局
には、上記送信機からの信号を復調した信号の符
号誤り率を上記ダイバシテイ通信を必要とする子
局ごとに検出して上記制御信号を生成する手段
と、この制御信号を該当する子局に転送する手段
とを備えたことを特徴とする。 Further, the present invention includes one master station and a plurality of slave stations, each of the slave stations transmits a burst signal to the master station during a time slot assigned to itself, and the master station The transmitter of the slave station that requires diversity communication is configured to receive this burst signal from each station in time series, and the transmitter of the slave station that requires diversity communication has two antennas and a transmitter for each of these two antennas. A time-sharing device comprising two transmitters that transmit signals and are connected to the same input, and a transmission signal switching means that selects which input of the two antennas the output of the transmitter should be connected to. In the space diversity communication system of multi-directional communication, the transmitting signal switching means of the slave station selects a time period other than the time period in which the burst signal assigned to that station is transmitted based on a control signal transmitted from the master station. The master station is configured to detect, for each slave station requiring the diversity communication, a bit error rate of a signal obtained by demodulating the signal from the transmitter, and generate the control signal. and means for transferring the control signal to the corresponding slave station.
以下、本発明実施例方式を図面に基づいて説明
する。
Hereinafter, an embodiment of the present invention will be explained based on the drawings.
第３図は本発明の第一実施例方式が利用されて
いる通信網の構成を示すブロツク構成図であり、
ここで、親局７０と子局７５Ａとの区間の通信に
対し、スペース・ダイバシテイ方式が用いられて
いる。第４図は第３図に示されるブロツクの内の
受信機３および計数回路９の構成を示すブロツク
構成図である。また、第５図は本発明第二実施例
方式が利用されている通信網の構成を示すブロツ
ク構成図であり、ここで親局７０と子局７５Ａと
の区間の通信に対し、スペース・ダイバシテイ方
式が用いられている。 FIG. 3 is a block configuration diagram showing the configuration of a communication network in which the system of the first embodiment of the present invention is used.
Here, a space diversity method is used for communication between the master station 70 and the slave station 75A. FIG. 4 is a block diagram showing the configuration of the receiver 3 and the counting circuit 9 among the blocks shown in FIG. Furthermore, FIG. 5 is a block diagram showing the configuration of a communication network in which the system of the second embodiment of the present invention is utilized. method is used.
まず、第一実施例方式の構成を第３図および第
４図に基づいて説明する。この実施例方式は、複
数の子局７５と親局７０とで構成され、ここで、
子局７５Ａは、送信側ベースバンド信号処理回路
（以下、送信信号処理回路という。）１と、送信機
２と、バースト・オン・オフ・スイツチ回路（以
下、バースト・スイツチ回路という。）７と、送
信信号切換器８と、送信信号切換制御器９と、主
アンテナ５１と、副アンテナ５２とを備えてい
る。また、親局７０は、受信機３と、受信側ベー
スバンド信号処理回路（以下、受信信号処理回路
という。）５と、競合計数回路（以下計数回路と
いう。）６とを備えている。さらに、この親局の
受信機３は、復調回路３１と、識別器３２ａおよ
び３２ｂと、比較器３４とで構成され、また、こ
の計数回路６は、バースト・ゲート回路６１と計
数器６２とで構成されている。 First, the configuration of the first embodiment system will be explained based on FIGS. 3 and 4. This embodiment system is composed of a plurality of slave stations 75 and a master station 70, and here,
The slave station 75A includes a transmission side baseband signal processing circuit (hereinafter referred to as a transmission signal processing circuit) 1, a transmitter 2, a burst on-off switch circuit (hereinafter referred to as a burst switch circuit) 7, and a transmitter 2. , a transmission signal switching device 8, a transmission signal switching controller 9, a main antenna 51, and a sub-antenna 52. The master station 70 also includes a receiver 3, a receiving side baseband signal processing circuit (hereinafter referred to as a received signal processing circuit) 5, and a competition counting circuit (hereinafter referred to as a counting circuit) 6. Furthermore, the receiver 3 of this master station is composed of a demodulation circuit 31, discriminators 32a and 32b, and a comparator 34, and the counting circuit 6 is composed of a burst gate circuit 61 and a counter 62. It is configured.
子局７５Ａの送信信号処理回路１の第一の出力
は送信機２の入力に接続され、送信機２の出力は
バースト・スイツチ回路７の第一の入力に接続さ
れ、また、送信信号処理回路１の第二の出力はバ
ースト・スイツチ回路７の第二の入力および送信
信号切換制御器９の第一の入力に接続され、さら
に、バースト・スイツチ回路７の出力は送信信号
切換器８の第一の入力に接続され、送信信号切換
制御器９の出力は送信信号切換器８の第二の入力
に接続され、送信信号切換器８の第一の出力は主
アンテナ５１の入力に接続され、送信信号切換器
８の第二の出力は副アンテナ５２の入力に接続さ
れる。子局７５Ａの主アンテナ５１および副アン
テナ５２の出力信号は親局７０のアンテナ５０の
入力信号となり、アンテナ５０の出力は受信機３
の入力に接続される。受信機３の出力は受信信号
処理回路５の入力に接続され、受信機３の第二の
出力は計数回路６の第一の入力に接続され、受信
信号処理回路５の出力は計数回路６の第二の入力
に接続され、計数回路６の出力信号は送信信号切
換制御器９の入力信号になる。また、受信機３で
は、この受信機３の入力が復調回路３１の入力に
接続され、復調回路３１の出力は第一の識別器３
２ａの入力および第二の識別器３２ｂの入力に接
続され、第一の識別器３２ａの出力は比較器３４
の第一の入力および受信信号処理回路５の入力に
接続される。第二の識別器３２ｂの出力は比較器
３４の第二の入力に接続され、比較器３４の出力
は計数回路６の入力に接続される。また、計数回
路６では、この計数回路６の第一の入力がバース
ト・ゲート回路６１の第一の入力に接続され、こ
の計数回路６の第二の入力がバースト・ゲート回
路６１の第二の入力に接続され、バースト・ゲー
ト回路６１の出力は計数器６２の入力に接続さ
れ、計数器６２の出力はこの計数回路６の出力と
なり、図示しない送信装置を介して子局７５Ａの
切換制御回路にアンテナ切換信号としては伝送さ
れる構成である。 The first output of the transmission signal processing circuit 1 of the slave station 75A is connected to the input of the transmitter 2, the output of the transmitter 2 is connected to the first input of the burst switch circuit 7, and the transmission signal processing circuit The second output of the burst switch circuit 7 is connected to the second input of the burst switch circuit 7 and the first input of the transmit signal switching controller 9; the output of the transmission signal switching controller 9 is connected to the second input of the transmission signal switching device 8, the first output of the transmission signal switching device 8 is connected to the input of the main antenna 51, A second output of the transmission signal switch 8 is connected to an input of the auxiliary antenna 52. The output signals of the main antenna 51 and the sub antenna 52 of the slave station 75A become the input signals of the antenna 50 of the master station 70, and the output of the antenna 50 becomes the input signal of the antenna 50 of the master station 70.
connected to the input of The output of the receiver 3 is connected to the input of the received signal processing circuit 5, the second output of the receiver 3 is connected to the first input of the counting circuit 6, and the output of the received signal processing circuit 5 is connected to the input of the counting circuit 6. The output signal of the counting circuit 6 becomes the input signal of the transmit signal switching controller 9. Further, in the receiver 3, the input of the receiver 3 is connected to the input of the demodulation circuit 31, and the output of the demodulation circuit 31 is connected to the first discriminator 3.
2a and the input of the second discriminator 32b, and the output of the first discriminator 32a is connected to the comparator 34.
and the input of the received signal processing circuit 5. The output of the second discriminator 32b is connected to the second input of the comparator 34, and the output of the comparator 34 is connected to the input of the counting circuit 6. Further, in the counting circuit 6, the first input of the counting circuit 6 is connected to the first input of the burst gate circuit 61, and the second input of the counting circuit 6 is connected to the second input of the burst gate circuit 61. The output of the burst gate circuit 61 is connected to the input of a counter 62, and the output of the counter 62 becomes the output of this counting circuit 6, which is connected to the switching control circuit of the slave station 75A via a transmitting device (not shown). The antenna switching signal is transmitted as an antenna switching signal.
次に、この第一実施例方式の動作を第３図およ
び第４図に基づいて説明する。 Next, the operation of this first embodiment will be explained based on FIGS. 3 and 4.
ダイバシテイ通信の必要な子局ごとに伝送路状
態を監視する計数回路６で、入力される受信機３
で誤り率が高くなると発生する誤りパルスを各子
局に割り当てられたバースト時間帯内でバースト
タイミングパルスによつて計数する。このバース
トタイミングパルスは信号処理回路５内のタイミ
ングジエネレータ回路から供給されている。 A counting circuit 6 that monitors the transmission path status of each slave station that requires diversity communication receives input from the receiver 3.
Error pulses that occur when the error rate becomes high are counted using burst timing pulses within the burst time slot assigned to each slave station. This burst timing pulse is supplied from a timing generator circuit within the signal processing circuit 5.
子局７５Ａのバースト時間が過ぎると、計数回
路６ではその状態が保持され、再び子局７５Ａの
バースト時間になるとその計数が再開される。あ
らかじめ設定された規定数がカウントアツプされ
ると子局７５Ａのアンテナの切換を指示する制御
信号が出力される。この制御信号は、図示されて
いない送信装置を介して例えばアンテナ５０から
親局７０から子局７５Ａ向けのベースバンド信号
に多重化されている子局７５Ａ用に付加された制
御ビツトを用いて、子局７５Ａに転送される。 When the burst time of the slave station 75A has passed, the counting circuit 6 maintains that state, and restarts counting when the burst time of the slave station 75A comes again. When a predetermined number is counted up, a control signal instructing the switching of the antenna of the slave station 75A is output. This control signal is transmitted using a control bit added for the slave station 75A that is multiplexed from the antenna 50 to the baseband signal for the slave station 75A from the master station 70 via a transmitting device (not shown). The data is transferred to the slave station 75A.
子局７５Ａでは、例えばアンテナ５１あるいは
５２を介して図示されていない受信装置で受信し
た親局７０からのアンテナ切換の制御信号を送信
信号切換制御器９に入力する。 In the slave station 75A, a control signal for antenna switching from the master station 70 received by a receiving device (not shown) via the antenna 51 or 52, for example, is input to the transmission signal switching controller 9.
スペース・ダイバシテイ通信の必要な子局７５
Ａでは送信機２の出力信号はバースト信号とする
ためのバーストスイツチ回路７を経た後に、この
信号を主アンテナ５１あるいは副アンテナ５２の
いずれかから出力するかを選択する送信信号切換
器８に入力される。一方、親局から転送されてき
た制御信号が送信信号切換制御器９に入力され
る。送信信号切換制御器９では、この制御信号に
基づいて、送信信号切換器８が駆動され、現用の
アンテナが選定される。この切換はこの子局７５
Ａに割り当てられているバースト信号を送出する
時間帯には行われず、バースト信号を送出し終え
てから次のバースト信号を送出し始めるまでの、
バースト間の時間内に切換を完了するように行わ
れる。このバーストタイミングは送信信号処理回
路１から入力される信号によつて制御される。 Slave station 75 requiring space diversity communication
In A, the output signal of the transmitter 2 passes through a burst switch circuit 7 for converting it into a burst signal, and then is input to a transmission signal switch 8 that selects whether to output this signal from the main antenna 51 or the auxiliary antenna 52. be done. On the other hand, the control signal transferred from the master station is input to the transmission signal switching controller 9. In the transmission signal switching controller 9, the transmission signal switching device 8 is driven based on this control signal, and the currently used antenna is selected. This switching is done by this slave station 75.
It is not performed during the time period when the burst signal assigned to A is transmitted, but after the end of transmitting the burst signal until the start of transmitting the next burst signal.
This is done to complete the switching within the time between bursts. This burst timing is controlled by a signal input from the transmission signal processing circuit 1.
一方、子局７５Ａの受信系は、第２図で示した
従来例ダイバシテイ方式が適用でき、子局７５Ａ
のアンテナ５１および５２を共用する双方向ダイ
バシテイ方式で構成できる。 On the other hand, the conventional diversity method shown in FIG. 2 can be applied to the receiving system of the slave station 75A.
It can be constructed using a bidirectional diversity system in which the antennas 51 and 52 are shared.
さらに、第４図に基づいて親局７０における制
御信号の生成過程を説明する。 Furthermore, the process of generating control signals in the master station 70 will be explained based on FIG.
受信機３は、バースト信号の復調回路３１と、
第一の識別器３２ａと、作為的に誤り率を高くさ
せた第二の識別器３２ｂと、識別器３２ａおよび
３２ｂの出力を比較し、誤りパルスを発生させる
比較器３４とで構成されていて、子局７５Ａから
の受信信号に誤り率が高くなり始めると識別器３
２ａおよび３２ｂの出力により、比較器３４から
誤りパルスが出力される。計数回路６はバースト
ゲート回路６１および「Ｎ」ビツトの計数器６２
で構成されていて、「Ｎ」の値は切換までの検出
時間を考慮して適当な値に決められている。計数
器６２は「Ｎ」ビツトカウントアツプされると、
子局７５Ａへの制御信号が送出されると同時に、
子局７５Ａでアンテナが切換えられた後のバース
トから計数が開始できるように計数器がリセツト
される。なお受信信号処理回路５は各子局ごとに
パリテイビツトの検出を行いパリテイビツトの検
出計数によつて計数回路６で制御信号を作成する
ようにしてもよい。 The receiver 3 includes a burst signal demodulation circuit 31;
It is composed of a first discriminator 32a, a second discriminator 32b whose error rate is artificially increased, and a comparator 34 which compares the outputs of the discriminators 32a and 32b and generates an error pulse. , when the error rate of the received signal from the slave station 75A starts to increase, the discriminator 3
The outputs of 2a and 32b cause the comparator 34 to output an error pulse. The counting circuit 6 includes a burst gate circuit 61 and an "N" bit counter 62.
The value of "N" is determined to be an appropriate value in consideration of the detection time until switching. When the counter 62 counts up "N" bits,
At the same time as the control signal is sent to slave station 75A,
The counter is reset so that counting can start from the burst after the antenna is switched at slave station 75A. The received signal processing circuit 5 may detect parity bits for each slave station, and the counting circuit 6 may generate a control signal based on the detected parity bits.
次に、本発明の第二実施例方式を第５図に基づ
いて説明する。親局７０の構成は第一実施例方式
と同一であるが、子局７５Ａでは、送信信号処理
回路１の出力が分岐回路１０で分岐され、同期し
た同じベースバンド信号が第一の送信機２ａと第
二の送信機２ｂとのそれぞれに入力され、変調が
行われる。送信機２ａおよび２ｂの出力がバース
トスイツチ回路７に入力されそれぞれ主アンテナ
５１および副アンテナ５２に導かれる。制御回路
１１では、親局７０から転送された制御信号が入
力され、バーストタイミングと一致させてバース
ト・スイツチ回路が制御される。このため親局７
０での符号誤り率が高くなつたアンテナからの出
力は断にされ、それまで出力断であつたアンテナ
からバースト信号が送出されるように制御され
る。 Next, a second embodiment of the present invention will be explained based on FIG. The configuration of the master station 70 is the same as that of the first embodiment, but in the slave station 75A, the output of the transmission signal processing circuit 1 is branched by the branch circuit 10, and the same synchronized baseband signal is sent to the first transmitter 2a. and the second transmitter 2b, respectively, and modulation is performed. The outputs of transmitters 2a and 2b are input to burst switch circuit 7 and guided to main antenna 51 and sub antenna 52, respectively. In the control circuit 11, the control signal transferred from the master station 70 is input, and the burst switch circuit is controlled to match the burst timing. For this reason, the master station 7
The output from the antenna whose bit error rate at 0 has become high is cut off, and control is performed so that the burst signal is sent out from the antenna whose output was cut off until then.
なお、この実施例方式で用いられている制御信
号の転送手段に代わり、親局７０の送信搬送波に
浅い周波数変調を与えて複合伝送するアナログ伝
送路を用いた制御信号の転送手段を用いても本発
明を実施することができる。 Note that instead of the control signal transfer means used in this embodiment system, a control signal transfer means using an analog transmission path that applies shallow frequency modulation to the transmitted carrier wave of the master station 70 and performs composite transmission may be used. The invention can be practiced.
本発明は、以上説明したように、時分割多方向
通信網で、伝播条件の悪い子局が生じた場合に、
子局ごとに独立に回線品質を改善できる効果があ
る。また、親局側で子局からの回線状態を監視し
てアンテナ切換を制御するように構成しているた
め子局に対して回線状態監視のための折り返し回
線を設定する必要がなく回線利用効率を高くする
ことができる。
As explained above, when a slave station with poor propagation conditions occurs in a time-division multidirectional communication network, the present invention provides
This has the effect of improving line quality independently for each slave station. In addition, since the master station is configured to monitor the line status from the slave station and control antenna switching, there is no need to set up a return line for monitoring the line status for the slave station, resulting in improved line usage efficiency. can be made higher.
さらに、親局に副アンテナが設けられていない
ので、スペース・ダイバシテイ効果を高めるため
の主アンテナと副アンテナとの間隔選択上の問題
点がなく、さらに子局ごとに副アンテナが設けら
れているので、子局ごとのそれぞれの区間で最適
なダイバシテイ効果を得るように構成することが
でき、回線品質の改善効果が顕著になる。 Furthermore, since the master station is not provided with a sub-antenna, there is no problem in selecting the spacing between the main antenna and the sub-antenna to enhance the space diversity effect, and furthermore, each sub-station is provided with a sub-antenna. Therefore, it is possible to configure the system so that the optimum diversity effect can be obtained in each section of each slave station, and the effect of improving the line quality becomes remarkable.
また、アンテナの切換が自局に割り当てられた
時間帯でない時間帯で行われるので、データ信号
の伝送の瞬断が生じない利点がある。 Furthermore, since antenna switching is performed in a time slot other than the time slot assigned to the local station, there is an advantage that no momentary interruption of data signal transmission occurs.
第１図は時分割多方向通信網の構成および動作
を説明する模式図。第２図は従来例装置の構成を
示すブロツク構成図。第３図は本発明第一実施例
方式の構成を示すブロツク構成図。第４図は第３
図の内の受信機３および計数回路６の構成を示す
ブロツク構成図。第５図は本発明第二実施例方式
の構成を示すブロツク構成図。
１……送信信号処理回路、２……送信機、３…
…受信機、４……受信信号切換器、５……受信信
号処理回路、６……計数回路、７……バースト・
スイツチ回路、８……送信信号切換器、９……送
信信号切換制御器、１０……分岐回路、１１……
制御回路、３１……復調回路、３２ａ，３２ｂ…
…識別器、３４……比較器、５０，５１，５２…
…アンテナ、７０……親局、７５……子局。
FIG. 1 is a schematic diagram illustrating the configuration and operation of a time-division multidirectional communication network. FIG. 2 is a block configuration diagram showing the configuration of a conventional device. FIG. 3 is a block configuration diagram showing the configuration of the system according to the first embodiment of the present invention. Figure 4 is the third
FIG. 3 is a block configuration diagram showing the configurations of the receiver 3 and the counting circuit 6 shown in the figure. FIG. 5 is a block configuration diagram showing the configuration of a system according to a second embodiment of the present invention. 1... Transmission signal processing circuit, 2... Transmitter, 3...
...Receiver, 4...Reception signal switch, 5...Reception signal processing circuit, 6...Counting circuit, 7...Burst/
Switch circuit, 8... Transmission signal switch, 9... Transmission signal switching controller, 10... Branch circuit, 11...
Control circuit, 31... Demodulation circuit, 32a, 32b...
...Discriminator, 34...Comparator, 50, 51, 52...
...antenna, 70...master station, 75...slave station.
Claims (1)
間帯に上記親局へバースト信号を送信し、上記親
局は上記子局のそれぞれからこのバースト信号を
時系列的に受信するように構成され、 上記子局のうちダイバシテイ通信を必要とする
子局の送信装置には、 二つのアンテナと、 この二つのアンテナのいずれかに接続できる一
つの送信機と、 この送信機の出力を上記二つのアンテナのいず
れの入力に接続するかの選択を実行する送信信号
切換手段と を備えた時分割多方向通信のスペース・ダイバシ
テイ通信方式において、 上記子局の送信信号切換手段は、上記親局から
送信される制御信号に基づいてその局に割り当て
られたバースト信号を送信する時間帯以外の時間
帯に切換を実行する手段を備え、 上記親局には、 上記送信機からの信号を復調した信号の符号誤
り率を上記ダイバシテイ通信を必要とする子局ご
とに検出して上記制御信号を生成する手段と、 この制御信号を該当する子局に転送する手段と を備えたことを特徴とする時分割多方向通信のス
ペース・ダイバシテイ通信方式。 ２ 一つの親局と、 複数の子局と を備え、 上記子局のそれぞれは自局に割り当てられた時
間帯に上記親局へバースト信号を送信し、上記親
局は上記子局のそれぞれからこのバースト信号を
時系列的に受信するように構成され、 上記子局のうちダイバシテイ通信を必要とする
子局の送信装置には、 二つのアンテナと、 この二つのアンテナのそれぞれに信号を送出し
同一の入力に接続された二つの送信機と、 この送信機の出力を上記二つのアンテナのいず
れの入力に接続するかの選択を実行する送信信号
切換手段と を備えた時分割多方向通信のスペース・ダイバシ
テイ通信方式において、 上記子局の送信信号切換手段は、上記親局から
送信される制御信号に基づいてその局に割り当て
られたバースト信号を送信する時間帯以外の時間
帯に切換を実行する手段を備え、 上記親局には、 上記送信機からの信号を復調した信号の符号誤
り率を上記ダイバシテイ通信を必要とする子局ご
とに検出して上記制御信号を生成する手段と、 この制御信号を該当する子局に転送する手段と を備えたことを特徴とする時分割多方向通信のス
ペース・ダイバシテイ通信方式。[Claims] 1. Comprising one master station and a plurality of slave stations, each of the slave stations transmits a burst signal to the master station during the time slot assigned to itself, and the master station The transmitter of the slave station that requires diversity communication is configured to receive this burst signal from each of the slave stations in time series, and has two antennas, and one of the two antennas. space diversity time-division multidirectional communication comprising one transmitter that can be connected to either antenna, and transmission signal switching means that selects which input of the two antennas the output of this transmitter is connected to. In the communication system, the transmission signal switching means of the slave station includes means for performing switching in a time zone other than the time zone for transmitting the burst signal assigned to that station based on the control signal transmitted from the master station. The master station includes means for detecting the bit error rate of a signal obtained by demodulating the signal from the transmitter for each slave station requiring the diversity communication and generating the control signal; A space diversity communication method for time division multidirectional communication, characterized by comprising means for transmitting data to a corresponding slave station. 2. Comprising one master station and a plurality of slave stations, each of the slave stations transmits a burst signal to the master station during the time period assigned to it, and the master station receives signals from each of the slave stations. The transmitter of the slave station that requires diversity communication is configured to receive this burst signal in time series, and the transmitter of the slave station that requires diversity communication has two antennas, and a signal is sent to each of these two antennas. Time-division multidirectional communication comprising two transmitters connected to the same input, and a transmission signal switching means for selecting which input of the two antennas the output of the transmitter is connected to. In the space diversity communication system, the transmission signal switching means of the slave station performs switching in a time zone other than the time zone in which the burst signal assigned to that station is transmitted based on the control signal transmitted from the master station. The master station includes means for detecting a bit error rate of a signal obtained by demodulating the signal from the transmitter for each slave station requiring the diversity communication and generating the control signal; A space diversity communication system for time division multidirectional communication, characterized by comprising means for transferring control signals to corresponding slave stations.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59072364A JPS60214641A (en) | 1984-04-10 | 1984-04-10 | Space diversity communication system |
| US06/720,090 US4599734A (en) | 1984-04-10 | 1985-04-05 | Space diversity communications system for multi-direction time division multiplex communications |
| DE8585104292T DE3583624D1 (en) | 1984-04-10 | 1985-04-09 | COMMUNICATION SYSTEM WITH SPACE DIVERSITY FOR MULTI-DIRECTIONAL CONNECTIONS IN TIME MULTIPLEX. |
| EP85104292A EP0158327B1 (en) | 1984-04-10 | 1985-04-09 | Space diversity communications system for multi-direction time division multiplex communications |
| CA000478550A CA1229437A (en) | 1984-04-10 | 1985-04-09 | Space diversity communications system for multi- direction time division multiplex communications |
| AU40984/85A AU568055B2 (en) | 1984-04-10 | 1985-04-10 | Tdm space diversity system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59072364A JPS60214641A (en) | 1984-04-10 | 1984-04-10 | Space diversity communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60214641A JPS60214641A (en) | 1985-10-26 |
| JPH0480570B2 true JPH0480570B2 (en) | 1992-12-18 |
Family
ID=13487182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59072364A Granted JPS60214641A (en) | 1984-04-10 | 1984-04-10 | Space diversity communication system |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4599734A (en) |
| EP (1) | EP0158327B1 (en) |
| JP (1) | JPS60214641A (en) |
| AU (1) | AU568055B2 (en) |
| CA (1) | CA1229437A (en) |
| DE (1) | DE3583624D1 (en) |
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| CN114362807B (en) * | 2021-12-27 | 2024-01-02 | 北京遥感设备研究所 | Double-antenna rapid switching system and method for low-orbit satellite communication terminal |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4884518A (en) * | 1972-02-10 | 1973-11-09 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3095538A (en) * | 1960-10-28 | 1963-06-25 | Silberstein Richard | Satellite relay station using antenna diversity selection |
| US3582879A (en) * | 1969-04-25 | 1971-06-01 | Computer Mode Corp | Communication channel equalization system and equalizer |
| US4099121A (en) * | 1976-06-11 | 1978-07-04 | Communications Satellite Corporation | Spatial diversity satellite communications system with error control |
| JPS54158810A (en) * | 1978-06-06 | 1979-12-15 | Nec Corp | Time-division multidirectional multiplex communication system |
| JPS58202642A (en) * | 1982-05-21 | 1983-11-25 | Nec Corp | Space diversity receiver |
| JPS60212048A (en) * | 1984-04-06 | 1985-10-24 | Nec Corp | Code correcting type switching system |
-
1984
- 1984-04-10 JP JP59072364A patent/JPS60214641A/en active Granted
-
1985
- 1985-04-05 US US06/720,090 patent/US4599734A/en not_active Expired - Lifetime
- 1985-04-09 CA CA000478550A patent/CA1229437A/en not_active Expired
- 1985-04-09 DE DE8585104292T patent/DE3583624D1/en not_active Expired - Fee Related
- 1985-04-09 EP EP85104292A patent/EP0158327B1/en not_active Expired - Lifetime
- 1985-04-10 AU AU40984/85A patent/AU568055B2/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4884518A (en) * | 1972-02-10 | 1973-11-09 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4644886B2 (en) * | 1998-06-05 | 2011-03-09 | 三菱化学株式会社 | Transition metal compound, catalyst component for olefin polymerization, and method for producing α-olefin polymer |
Also Published As
| Publication number | Publication date |
|---|---|
| US4599734A (en) | 1986-07-08 |
| AU568055B2 (en) | 1987-12-10 |
| JPS60214641A (en) | 1985-10-26 |
| CA1229437A (en) | 1987-11-17 |
| AU4098485A (en) | 1985-10-17 |
| EP0158327A2 (en) | 1985-10-16 |
| EP0158327B1 (en) | 1991-07-31 |
| EP0158327A3 (en) | 1987-09-23 |
| DE3583624D1 (en) | 1991-09-05 |
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